Liquid direct dye formulations

Abstract

The present invention relates to aqueous liquid formulations comprising 5-30% by weight of a dye composition comprising 25-85% by weight of Direct Brown 44 15-75% by weight of Direct Yellow 11 and/or of a dye obtainable by reduction or thermal treatment of Direct Yellow 11 0-15% by weight of one or more blue direct dyes and 0-10% by weight of one or more red direct dyes all based on the dye composition 0.5-15% by weight of one or more alkylamines whose one, two or three alkyl radicals may each be substituted by one or two hydroxyl groups and/or amino groups and/or interrupted by one or two oxygen atoms in ether function, based on the total weight of the aqueous liquid formulation, the sodium content of the liquid formulation not exceeding 0.3% by weight, and also their use for dyeing cellulose material especially paper.

1. An aqueous liquid formulation comprising
 5-30% by weight of a dye composition comprising 
 25-85% by weight of Direct Brown 44 
 15-75% by weight of Direct Yellow 11 and/or of a dye obtainable by reduction or thermal treatment of Direct Yellow 11 
 0-15% by weight of one or more blue direct dyes and 
 0-10% by weight of one or more red direct dyes 
 all based on the dye composition, and 
 0.5-15% by weight of one or more alkylamines whose one, two or three alkyl radicals may each be substituted by one or two hydroxyl groups and/or amino groups and/or interrupted by one or two oxygen atoms in ether function, 
 based on the total weight of the aqueous liquid formulation, the sodium content of the liquid formulation not exceeding 0.3% by weight. 
 
     
     
       2. The aqueous liquid formulation according to  claim 1  whose dye composition consists of
 25-85% by weight of Direct Brown 44 
 15-75% by weight of Direct Yellow 11 
 0-15% by weight of one or more blue direct dyes and 
 0-10% by weight of one or more red direct dyes 
 all based on the dye composition. 
 
     
     
       3. The aqueous liquid formulation according to  claim 1  wherein the whose dye composition consists of
 30-80% by weight of Direct Brown 44 
 20-70% by weight of Direct Yellow 11 
 0-15% by weight of one or more blue direct dyes and 
 0-10% by weight of one or more red direct dyes 
 all based on the dye composition. 
 
     
     
       4. The aqueous liquid formulation according to  claim 1  wherein the alkylamine is selected from the group consisting of ethanolamine, diethanolamine, triethanolamine, dimethylethanolamine, N-methyldiethanolamine, monomethylethanolamine, 2-(2-aminoethoxy)ethanol and aminoethylethanolamine. 
     
     
       5. The aqueous liquid formulation according to  claim 1  wherein the amount of the alkylamine is 0.5-10% by weight based on the total weight of the liquid formulation. 
     
     
       6. The aqueous liquid formulation according to  claim 1 , wherein the sodium content is ≦0.25% by weight. 
     
     
       7. The aqueous liquid formulation according to  claim 1  that comprises
 15-30% by weight of dye composition, and 
 0.5-8% by weight of mono-, di- and/or triethanolamine. 
 
     
     
       8. A method for dyeing paper and board comprising the use of the aqueous liquid formulation according to  claim 1 .